1. *Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands;
2. †Department of Experimental Immunohematology, Sanquin Research and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands;
3. ‡Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands;
4. §Department of Immunopathology, Sanquin Research and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands;
5. ¶Department of Rheumatology, Erasmus University Medical Center, Rotterdam, the Netherlands; and
6. ‖International Health Centre–Polikliniek Prins Willem, The Hague, the Netherlands